Process of manufacturing inside frosted bulbs



Sept. 15, 1936. T AR SE 2,054,707

PROCESS OF MANUFACTURING INSIDE FROSTED BULBS Filed March 21, 1933Patented Sept. 15, 1936 UNITED STATES PATENT OFFICE Tomisaburo Naruse,Minamishinagawa,

Shinagawa-ku, Tokyo, Japan Application March 21, 1933, Serial No.661,960

In Japan November 26, 1932' 3 Claims.

The invention relates to the type of process of manufacturing an insidefrosted bulb, in which an etching liquid is poured in the interior ofthe bulb by means of a liquid supply pipe, and then the liquid supplythus charged is sucked out by a pipe.

According to the feature of the invention, the corrosive or etchingliquid, during the time it is injected into the bulb, is subjected to anagitating motion at the outlet end of the pipe near the tip of the bulb,either by putting the liquid flow in a. whirling movement, or bydividing the liquid flow into a plurality of streams, or by dis--persing the liquid flow by means of an obstacle, arranged for thepurpose between the outlet end of the pipe and the inside tip of thebulb, and then the corrosive or etching liquid thus charged into thebulb is sucked out therefrom, by means of a pipe lowered down close tothe inside tip of the bulb, and'im'mediat'ely after such single etchingoperation, washing water is poured into the bulb to cleanse the latter.

In the known method for frosting the inside of a bulb, the corrosiveliquid is caused merely to flow out of a. supply pipe having the form ofa cylinder, and therefore, the frosting result obtained at the part ofthe bulb, where the flow or flux of the liquid concentrates, is muchdifferent from those obtained at other parts of the bulb, and is oftenaccompanied by specks or spots.

The invention has for its purpose to obviate such drawbacks, and also toobtain a uniform frosting of the inside of the bulb.

Other features and advantages of the invention are described below withreference to the attached drawing, which illustrate by way of examples,embodiments of apparatus for carrying out the invention, and in which:

Fig. 1 is a general view in a cross section of one embodiment; Fig. 2 isa cross section of the liquid supply pipe with the device mounted 'inthe outlet end thereof, said pipe and device are in a position where theliquid is to be poured;

Fig. 3 is a similar view to Fig. 2, but in this case, the pipe and thedevice are arranged for the liquid to be sucked out;

Figs. 4, 5, 6 and '7 show four devices adapted to be mounted in theoutlet end of the supply pipe, and adapted for giving an agitatingmotion to the corrosive or etching liquid; Fig. 8 shows in a crosssection a modified embodiment; and Fig. 9 shows a device adapted to bemounted in the pipe extension of Fig. 8.

Referring to Fig. l, the reference I shows a bulb, which is placed on astand with Its moutn directed upwards, and the etching liquid 5 isinjected into the interior of the bulb under pressure by means of one ormore supply pipes 2, and. the liquid thus charged is sucked out by thepipe, and in this Way an inside frosted bulb is obtained. In the knownmethods, however, a supply pipe having the form of a cylinder is used,and the etching liquid is' caused merely .to flow out of the pipe intothe interior of the bulb, with the result that the liquid flow isobliged to concentrate at a local part, and consequently, the frostingresult obtained at the part of the bulb, where the flow concentrates, isquite different from that obtained at other parts of the bulb, and isalso accompanied by specks or spots.

According to the invention, the etching liquid, during the time it isinjected into the interior of the bulb, is subjected to an agitatingmotion, whereby the result is obtained, that the difference between thefrosting degrees at the two parts is reduced to minimum, and at the sametime specks or spots never appear. Moreover,- according to the inventiona uniform frosting isobtained due to the fact that the etching liquid,after having been subjected to an agitating motion, can be evenlydistributed within and over the inside of the bulb. Further, if such anetching liquid contains powdered materials, such as cornflour, admixedtherein, the frosting can be considerably improved.

According to the invention, a partial frosting can also be obtainedeasily, as the etching liquid subjected to an agitating motion at theoutlet end of the supply pipe near the tip of the bulb is prevented fromreaching the uppermost part of the bulb, and a distinct boundary line ismarked between the frosted part and the transparent part.

lhe manner of carrying out the invention is now explained with referenceto the drawing. The bulb l is placed on a stand with its mouth directedupwards, and the supply pipe 2 is inserted in the interior of the bulb,and an etching liquid 5, contained in a compression vessel 3 connectedwith the pipe 2, is injected into the interior of the bulb. By means ofa piston 4, the liquid is alternately made to descend and ascend thereinby compression and suction respectively. According to the invention, adevice adapted for giving an agitating motion to the flow of the etchingliquid is mounted in the outlet end of the supply pipe 2. Such device isillustrated, by way of examples, in the different figures by the nozzlesb, c, d, e, f and 9. These devices are mounted within the cylindricalhollow body 6 and its extension forming the outlet end of the pipe 2,and are adapted to give an agitating motion to the flow of the etchingliquid flowing out of the pipe 2 near the tip of the bulb, either byputting the liquid flow in a whirling movement, or by dividing the flowinto a plurality of streams. The devices shown in Figs. 5 and '7 asnozzles 01 and g are adapted to cause a whirling motion, and those shownin Figs. 4, 2 and 6 by nozzles c, e, and f are adapted for dividing theliquid into a plurality of radial streams. As the liquid is thus put inan agitating movement, its flowing direction is, of course, deviated,and the liquid is evenly distributed over the inside of the bulb. Thespherical and. semispherical members shown in Figs. 2, 4 and Fig. 6 aretwo examples of an obstacleor baffle adapted for dispersing the liquid.

The etching liquid which has thus been changed into the interior of thebulb is subsequently sucked out by the supply pipe 2. For this purpose,said pipe is lowered down to come close to the inside bottom of thebulb, and the piston 4 is put in operation, whereby the liquid is suckedout upwardly from near the tip of the bulb (see Fig. 3 and Fig. 8). Theetching or frosting operation is thus completed in a single operation.After this single etching operation, washing water is poured into thebulb to cleanse the inside thereof, and the bulb is finally dried readyfor use.

- The inside surface thus frosted is of a beautiful milky colour, andthe tone ofthe colour, in its uniformity, is accordingly far superior incomparison with that obtained by the known methods.

I claim:

1. Process for frosting the interior of a bulb, in which an etchingliquid being mixed with powdered materials of the cornfiour type isinjected into the bulb through its upwardly directed neck and thensucked out therefrom in opposite direction; consisting in subjecting thesaid liquid to agitating motion while it is injected under pressure intothe bulb by a pipe, such agitating motion, by the aid of an agitatingmeans attached to the pipe end, taking place adjacent the tip of saidbulb, making the distance between the tip of v sisting in subjecting thesaid liquid to agitating motion, by dividing the liquid flow into aplurality of streams near the tip of the bulb, while it is injected by apipe, under pressure, into the bulb,

such agitating motion, by the aid of an agitating means attached to thepipe end, taking place adjacent the tip of the bulb, making the distancebetween the tip of the bulb and the opening of the pipe shorter,subsequently sucking out such liquid upwardly through the pipe from nearthe tip of the bulb and pouring water into the bulb immediately afterthe completion of the etching operation to clean the bulb.

3. Process for frosting the interior surfacev of a bulb, in which anetching liquid mixed with powdered materials of the cornflour type isinjected into the bulb through its upwardly directed neck and thensucked out therefrom in opposite direction: consisting in subjecting thesaid liquid to agitating motion, by whirling the liquid near the tip ofthe bulb, while it is injected by a pipe, under pressure, into the bulb:such agitating motion, by the aid of an agitating means attached to thepipe'end, taking place adjacent the tip of the bulb, making the distancebetween the tip of the bulb and the opening of the pipe shorter,subsequently sucking out such liquids upwardly through the pipe fromnear the tip of the bulb and pouring water into the bulb immediatelyafter the completion of the etching operation to clean the bulb.

TOMISABURO NARUSE.

